How does pacemaker resource "ethmonitor" check status of the link?
Issue
According to description of "ethmonitor" resource in pcs resource describe ethmonitor the ethmonitor works in 3 different modes to test the interface vitality:
- call ip to see if the link status is up (if link is down -> error)
- call ip and watch the RX counter (if packages come around in a certain time -> success)
- call arping to check whether any of the IPs found in the local ARP cache answers an ARP REQUEST (one answer -> success)
- return error
But how is each check evaluated? Do all 3 checks run? What if only one of them fails?
Environment
- Red Hat Enterprise Linux 6.5 or later
- Red Hat Enterprise Linux 7.0 or later
- High availability cluster based on pacemaker
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